Lewis Hamilton has no intention of easing up this weekend as he seeks a mere top-five finish in the Mexican Grand Prix to clinch his fourth world title and a place among the greatest drivers in Formula One history.

The arguments over his status have grown in volume this year, but they reached a new crescendo this week, following his ninth win of the season at last Sunday's United States Grand Prix in Texas.

Mercedes team chief Toto Wolff declared the Briton to be on course to become "the best driver that has ever existed" while veteran Brazilian Felipe Massa, who missed out on the 2008 title when Hamilton stole it with a passing move at the final corner of the decisive Brazilian Grand Prix, said he already ranks him alongside Michael Schumacher and Ayrton Senna.

Another title triumph will lift him clear of Jackie Stewart, on three championship wins, as the most successful British driver of all time, drawing him level on four with Alain Prost and his title rival Sebastian Vettel.

"There are still three races to go," said the 32-year-old Briton. "And in my mind, I still have three races to win. There are still a lot of points available - until you actually win the championship, you can't get ahead of yourself."

His caution is understandable as he and Mercedes know that despite the long straights and slow corners, the thin air at an altitude of 2,250 metres may play to the strengths of rivals Ferrari.

Mercedes will run with a high downforce set-up, as might be used in Monaco or Budapest, two circuits where they struggled this year, and this is the cause of their concerns.

You cannot really take him awayin a different level compared to Michael Schumacher andAyrton Senna.Williams driver Felipe Massa on Hamilt on

Vettel, despite trailing Hamilton by 66 points and needing a huge shift in form and fortunes, will not abandon his hopes of stopping the Englishman's immediate triumph.

But, as Massa put it, if anyone can win more or less anywhere in any conditions, it is Hamilton who has reeled off five wins in six races since the European summer.

"He is definitely one of the best drivers in the history of Formula One," said the Brazilian. "You cannot really take him away in a different level compared to Michael Schumacher and Ayrton Senna. He's there."

Wolff, a demanding team chief who has seen Hamilton add consistency and discipline to his unmatched talent for raw speed and aggressive racing, was even more fulsome.

"Lewis is about to break all records that have been set in Formula One and it is just a matter of time that people will say he is on track to being the best driver that has ever existed," he said. "This is the best Lewis - both on and off the track - that I have worked with since 2013."

Hamilton has attributed his rise to "another level of driving" to two main factors.

The first was the retirement of long-term teammate and rival Nico Rosberg who won last year's drivers' title and the second his switch to a vegan diet.

"In hindsight, all things happen for a reason," said Wolff, as his team celebrated four consecutive constructors' title triumphs last weekend.

All Hamilton needs on Monday morning (Singapore time) is nine more points, which can be achieved by a top-five finish.

But if nearest rival Vettel finishes second, Hamilton needs only to finish in the top nine to claim the title. If Vettel is third or worse, Hamilton will be champion even if he does not finish. - WIRE SERVICES